columnar epithelium

epithelium

[ep″ĭ-the´le-um] (pl. epithe´lia) (Gr.)

the cellular covering of internal and external surfaces of the body, including the lining of vessels and other small cavities. It consists of cells joined by small amounts of cementing substances. Epithelium is classified into types on the basis of the number of layers deep and the shape of the superficial cells.

transitional epithelium a type characteristically found lining hollow organs, such as the urinary bladder, that are subject to great mechanical change due to contraction and distention; originally thought to represent a transition between stratified squamous and columnar epithelium.

co·lum·nar ep·i·the·li·um

epithelium formed of a single layer of prismatic cells taller than they are wide.

Based on World Heath Organization (WHO) criteria, MCNs are defined as cystic epitheilal neoplasms composed of mucin producing columnar epithelium and an ovarian-type stroma which forms a band of densely packed stromal cells beneath the epithelium.

Bronchoscopy will often reveal a transformation of tissue from normal columnar epithelium into squamous epithelium, even when the reflux is nonacidic, but beyond that, finding the proper context for tissue changes such as cobblestoning and ruling out non-LPR origins can be a challenge.

On microscopic examination, the loculated cyst was found to be lined by cuboidal columnar epithelium merging with areas of thin squamous epithelium, and in one area there was a well-established invasive adenocarcinoma.

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